Construction method for permanently plugging sewage connecting pipe in channel box

Abstract

The application relates to the technical field of underground water pipe plugging treatment, and particularly discloses a permanent plugging construction method for a sewage connecting pipe in a channel box, which comprises the following steps: excavating a road surface and covering soil to the top of the channel box, and cutting a construction window on the top of the channel box; after the construction window is cut on the top of the channel box, underwater work is carried out in the channel box from the window, an inflatable air bag is used to preliminarily plug the connecting pipe, and water in the connecting pipe is in a static state; a cofferdam is built in the channel box, the cofferdam is located on the upstream of the connecting pipe, and the cofferdam is used to block the water from the upstream of the channel box; a water pumping device is arranged between the cofferdam and the connecting pipe, and the accumulated water between the cofferdam and the connecting pipe is discharged through the water pumping device; a retaining wall is built in the channel box corresponding to the connecting pipe, so that the connecting pipe is permanently plugged; the window on the top of the channel box is repaired, and the road surface is restored; the application has small construction land occupation, and cannot damage the ground and underground pipeline structure.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of underground water pipe plugging treatment, and particularly discloses a permanent plugging construction method for a sewage connecting pipe in a channel box. BACKGROUND

[0002] Underground drainage of a city is generally divided into sewage drainage and rainwater drainage. Sewage is discharged through a sewage pipe and finally enters a sewage treatment plant for treatment. Rainwater is generally discharged through a channel box and enters a river. In traditional municipal planning projects, a connecting pipe is connected between the sewage pipe and the channel box. Sewage in the sewage pipe can enter the channel box, and rainwater in the channel box can enter the sewage pipe to cope with heavy rain caused by extreme weather. The role is to speed up water discharge and avoid road flooding. However, with the expansion of the city and the upgrading and reconstruction of the road, the original sewage pipe flow increases sharply, which causes sewage in the sewage pipe to flow into the channel box through the connecting pipe, resulting in overflow of rainwater in the channel box. The odor and rainwater have seriously affected the life of the surrounding residents. Therefore, the connecting pipe needs to be plugged.

[0003] A subway station deep foundation pit deep buried water-rich sewage pipe plugging construction method disclosed in Chinese Patent Publication No. CN115094997A includes the following steps: 1. Upstream sewage pipe plugging; 2. Sewage pipe water accumulation pumping; 3. Downstream sewage pipe plugging; 4. Sewage pipe opening plugging. When the patent plugs the upstream water pipe by drilling and grouting, it adopts the form of combining a gas bag lowering hole with a concrete pouring hole. By injecting concrete into the downstream of the sewage pipe through a grouting pipe, the downstream position of the sewage pipe can be effectively plugged to prevent sewage from seeping into the subway foundation pit. However, when the patent is used for construction, two gas bag holes and one concrete pouring hole need to be drilled at the position of the sewage pipe. Drilling construction requires a large area of site, and drilling can damage the ground structure and pose a risk of damaging other pipelines under the ground. Underground drainage pipes in the city are usually located under major traffic arteries, and there are a large number of underground pipelines under major traffic arteries. The construction site is limited and cannot cause large-scale damage to the road.

[0004] Therefore, the inventor provides a permanent plugging construction method for a sewage connecting pipe in a channel box to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the problem that traditional pipeline plugging construction requires a large area of site, drilling for plugging the pipeline can easily damage the ground structure, and there is a risk of damaging other pipelines under the ground.

[0006] In order to achieve the above object, the basic scheme of the present application provides a sewer box sewage connecting pipe permanent plugging construction method, comprising a sewer box and a sewage pipe, the sewer box and the sewage pipe are located below the ground, and the sewage pipe is located below the sewer box, a connecting pipe is communicated between the sewer box and the sewage pipe, characterized in that the sewer box sewage connecting pipe permanent plugging construction method comprises the following steps:

[0007] Step S001, excavate the road surface and cover the soil to the top of the sewer box, and cut a construction window on the top of the sewer box;

[0008] Step S002, after cutting the construction window on the top of the sewer box, enter the inside of the sewer box from the window for underwater operation, use an inflatable air bag to preliminarily block the connecting pipe, so that the water flow in the connecting pipe is in a static state;

[0009] Step S003, build a cofferdam in the sewer box, the cofferdam is located upstream of the connecting pipe to block the water flow upstream of the sewer box;

[0010] Step S004, set up a water pumping device between the cofferdam and the connecting pipe, and discharge the accumulated water between the cofferdam and the connecting pipe through the water pumping device;

[0011] Step S005, build a retaining wall in the sewer box corresponding to the connecting pipe to permanently block the connecting pipe;

[0012] Step S006, repair the window on the top of the sewer box to restore the road surface.

[0013] Further, it further comprises a sealing wall prefabrication step, and a sealing wall is prefabricated; in step S002, after the water flow in the connecting pipe is in a static state, the inner surface of the connecting pipe is cleaned, and after the cleaning is completed, the prefabricated sealing wall is blocked in the connecting pipe to achieve further blocking of the connecting pipe.

[0014] Further, the sealing wall is built with cement mortar and solid bricks.

[0015] Further, in step S004, after the accumulated water between the cofferdam and the connecting pipe is drained, waterproof mortar is brushed on the side of the sealing wall close to the sewer box to prevent water seepage.

[0016] Further, in step S005, the retaining wall is in an "L" shape structure, the vertical part of the "L" shape structure is located in the sewer box and blocks the end of the connecting pipe close to the sewer box, and the bottom horizontal part of the "L" shape structure is arranged towards the sewer box.

[0017] Further, the retaining wall is fixedly connected with the sewer box through the embedded steel bar.

[0018] Further, the thickness of the retaining wall is not greater than 200mm.

[0019] Further, in any one of the steps S002 to S005, a cover plate can be arranged on the construction window.

[0020] Further, in the step S001, when the construction window is cut, a 180-220mm long reinforcing bar head is reserved around the window.

[0021] Further, in the step S006, when the window on the top of the channel box is repaired, the reinforcing bars are bound in the window and welded with the reinforcing bar heads reserved around the window, and then the concrete is poured to restore the road surface after the welding is completed.

[0022] The principle and effect of the present application are that:

[0023] 1. Compared with the prior art, the present application only needs to open a construction window on the top of the channel box, has a small construction area, can provide conditions for daytime traffic opening, adopts the form of a frogman cooperating with underwater installation of an air bag, a sealing wall and a retaining wall to achieve the effect of permanent plugging. Compared with the prior art, the present application does not need to drill multiple holes on the position above the sewage pipe, and does not need to occupy a large area of site, avoids the damage to the ground structure or pipeline caused by drilling, is suitable for sewage pipe plugging construction under municipal main roads, and solves the problems that the traditional pipeline plugging construction needs to occupy a large area of site, and the pipeline plugging by drilling is easy to cause damage to the ground structure and may damage other pipelines under the ground.

[0024] 2. Compared with the prior art, the present application is provided with a retaining wall, the retaining wall is arranged as an “L” type structure, the gravity of water exerts force on the bottom of the retaining wall, the retaining wall is stabilized, and is not washed away by water flow; at the same time, when the water flow in the channel box flows to the retaining wall, the upper part of the water and the lower part of the water form vortexes and eddies in the “L” type structure due to the different height and speed of the wave crest and wave trough of the water, the flow slowly reduces the kinetic energy and height of the water flow impact, thereby weakening the impact on the retaining wall and improving the stability of the connection pipe plugging. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a top view of the permanent plugging construction method for the sewage connection pipe in the channel box of the embodiment of the present application;

[0026] Figure 2 is the a-a line sectional view of Figure 1 in the embodiment of the present application;

[0027] Figure 3 is the b-b line sectional view of Figure 1 in the embodiment of the present application.

[0028] Figure 4 is an excavated road surface partial sectional view of the permanent plugging construction method for the sewage connection pipe in the channel box of the embodiment of the present application;

[0029] Figure 5 Figure 6 is a partial sectional view of the excavated road surface and cut top of the channel after the permanent plugging construction method of the sewage connecting pipe in the channel of the embodiment of the present application.

[0030] The drawings are only used for illustrative description, and should not be understood as a limitation on the patent; in order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the same or similar reference numerals correspond to the same or similar components; the positional relationship described in the drawings is only used for illustrative description, and should not be understood as a limitation on the patent.

[0031] Reference signs:

[0032] Channel 1, construction window 101, cover plate 2, connecting pipe 3, sewage pipe 4, sealing wall 5, retaining wall 6, air bag 7, water pumping device 8, cofferdam 9, soil pit 10, concrete corbel 11, support strip 12, steel structure 13, gate 14, steel bar head 15. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and description of the purpose of the present application, and should not be regarded as an improper limitation on the present application.

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the specific technical scheme of the present application will be further described in detail below in combination with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0035] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0036] In addition, in the embodiments of the present application, the orientation terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0037] In the embodiments of the present application, unless specifically defined and limited otherwise, the term "connection" should be interpreted broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0038] In the embodiments of the present application, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0039] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or designs. Rather, the use of "exemplary" or "for example" is intended to present concepts in a concrete manner. In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used to distinguish one feature from another, and do not denote or imply any hierarchy or order of importance.

[0040] The technical solutions of the present application will be described in detail below with reference to specific drawings.

[0041] First of all, it should be pointed out that, as shown in Figures 1-3 At present, the clean water and / or surface rainwater of the municipal government flows into the channel box 1 below the ground, and finally flows into the river from the channel box 1; the sewage of the city flows into the sewage pipe 4, and the sewage in the sewage pipe 4 finally flows into the sewage treatment plant, which treats the sewage; according to the planning of the traditional municipal engineering, the sewage pipe 4 is installed below the channel box 1, and the connection pipe 3 is communicated between the channel box 1 and the sewage pipe 4; when the sewage flow in the sewage pipe 4 is small, part of the clean water / rainwater in the channel box 1 flows into the river, and another part of the clean water / rainwater flows into the sewage pipe 4, which can cope with the heavy rain brought by extreme weather, and the role is to speed up the discharge of clean water / rainwater in the channel box, so as to avoid the situation that the road is flooded with water; however, with the increase of domestic sewage, and the limited water treatment capacity of the sewage treatment plant, affected by the downstream sewage pipe 4 network water level jacking and other factors, part of the sewage in the sewage pipe 4 enters the channel box 1 through the connection pipe 3, and the sewage entering the channel box 1 causes the water level of the channel box 1 to increase, and the water depth of the channel box 1 is more than 1m most of the time, even full channel, resulting in serious overflow problem, and the odor generated by overflow has seriously affected the life of the surrounding residents, therefore, in order to solve the overflow problem, it is necessary to ensure that the sewage does not flow into the channel box 1, and the clean water or rainwater does not flow into the sewage pipe 4, so the connection pipe 3 must be blocked to make the sewage pipe 4 work and the channel box 1 work without affecting each other.

[0042] The present application is usually arranged at night for the plugging construction of the connecting pipe 3, and the traffic is opened during the day, which is convenient for the nearby residents and office travel, and avoids causing traffic impact, please refer to Figures 1-5 The permanent plugging method of the sewer pipe 4 in the channel box 1 provided by the embodiment includes the following steps:

[0043] Step S001, excavate the road surface and cover the soil to the top of the channel box 1, and cut a construction window 101 on the top of the channel box 1;

[0044] As shown in Figure 4 and Figure 5 , first determine the position of the road surface to be excavated, and surround the position to be excavated with a fence, and use tools to excavate the soil pit 10 and remove the covering soil. The soil pit 10 is excavated to the top of the channel box 1, and the steel bars are tied in the soil pit 10, the formwork is erected, and the steel pipe and steel structure 13 are pre-buried in the soil pit 10. The soil pit 10 is supported, and the present application preferably uses the mode of common support of channel steel and steel plate to avoid the collapse of the soil pit 10 when the vehicle passes through the high-strength steel plate above the soil pit 10. At the same time, the concrete is poured in the formwork above the soil pit 10 to form the concrete crown beam 11. The upper surface of the concrete crown beam 11 is 150-320mm lower than the road surface. After the concrete strength of the concrete crown beam 11 reaches 75% of the design strength, the formwork is removed. When the traffic needs to be restored during the day, a plurality of support bars 12 are placed on the upper surface of the crown beam for support.

[0045] The support bar 12 of the present application is preferably an I30A H-beam. The H-beam is fixed to the top of the crown beam by expansion bolts at an interval of 0.3-1.0m. Two or more layers of high-strength steel plates are placed on the upper surface of the support bar 12 for paving. The thickness of the high-strength steel plate needs to be greater than 20mm. It is worth noting that the uppermost layer of high-strength steel plate after paving needs to be flush with the road surface to facilitate the passage of vehicles or pedestrians.

[0046] The concrete crown beam 11 is formed by pouring concrete above the soil pit 10, which plays a supporting role and can effectively resist the load borne by the upper part of the soil pit 10 structure when the vehicle passes through the high-strength steel plate, thereby avoiding damage to the soil pit 10.

[0047] Further, as shown in Figure 5As shown, the top of the channel box 1 is cut by a cutting tool, and a construction window 101 is cut by static cutting, the cut part of the channel box 1 is the top plate of the channel box 1, and the application preferably cuts a window of 3m*2m (of course, it can be understood that the size of the construction window 101 is set according to the actual construction condition, and the application does not limit it), and the concrete member outside the position of the construction window 101 should not be damaged during cutting, and a 180-200mm reinforcing bar head 15 is reserved on the side of the construction window 101 for subsequent repair of the construction window 101, and the application preferably reserves a 200mm reinforcing bar head 15 on the side of the construction window 101.

[0048] After the construction window 101 is cut on the top of the channel box 1, underwater work is carried out from the construction window 101 into the inside of the channel box 1, and an inflatable air bag 7 is used to preliminarily block the connecting pipe 3, so that the water flow in the connecting pipe 3 is in a static state.

[0049] As shown in Figure 2 and Figure 5 After the safety rope is tied, the diver frogman enters the channel box 1 from the construction window 101 to carry out underwater work, carries the inflatable air bag 7 into the connecting pipe 3 from the inside of the channel box 1, inflates the air bag 7 underwater, and temporarily blocks the connecting pipe 3, so that the water flow in the connecting pipe 3 is in a static state (that is, the clean water / rainwater in the channel box 1 temporarily does not flow into the sewage pipe 4, or the sewage in the sewage pipe 4 temporarily does not flow into the channel box 1).

[0050] The application also includes a prefabricated sealing wall 5 step, specifically, after the air bag 7 is blocked, the diver frogman first removes the inner surface of the connecting pipe 3, and then builds the sealing wall 5.

[0051] The sealing wall 5 is built by cement mortar and solid bricks; the cement of the application preferably uses M15 quick-drying cement mortar, and the solid bricks preferably use MU15 strength solid bricks. The sealing wall 5 is prefabricated, specifically, the cement and the mortar are mixed on the shore in a ratio of 1:4.53, one, two or more of water glass, quick-drying agent and coagulant are added during the mixing process, and the mixing should be done with the building, after the prefabrication of the sealing wall 5, the sealing wall 5 is hoisted into the channel box 1, and the diver frogman carries the sealing wall 5 into the connecting pipe 3 for further blocking.

[0052] Step S003, building a cofferdam 9 in the channel box 1, the cofferdam 9 is located upstream of the connecting pipe 3 to block the water upstream of the channel box 1.

[0053] As shown in Figure 4As shown, the height of the cofferdam 9 is determined according to the actual construction environment (for example, when the water flow in the channel box 1 is large, the height of the cofferdam 9 needs to be increased accordingly; otherwise, the height of the cofferdam 9 can be appropriately reduced), and the purpose of building the cofferdam 9 is to block the upstream water of the channel box 1, and at the same time, open the downstream gate 14 of the channel box 1, so that the channel box 1 is drained, and the downstream of the cofferdam 9 in the channel box 1 is in a "dry pond" condition. By blocking the upstream water through the cofferdam 9, it is convenient for the subsequent permanent plugging construction of the connecting pipe 3.

[0054] Step S004, a water pumping device 8 is arranged between the cofferdam 9 and the connecting pipe 3, and the accumulated water between the cofferdam 9 and the connecting pipe 3 is discharged through the water pumping device 8;

[0055] Specifically, after the cofferdam 9 of the channel box 1 is built, the water pumping device 8 is preferably an emergency water pump. Although the cofferdam 9 can block most of the upstream water of the channel box 1, the cofferdam 9 is a concrete structure, and the cofferdam 9 may leak due to dry shrinkage of the concrete or unclean channel box 1 wall, so that the concrete and the channel box 1 are not tightly combined. There is still part of the clear water / rainwater in the channel box 1 flowing through the cofferdam 9 to form accumulated water between the cofferdam 9 and the connecting pipe 3. The water pumping device 8 is arranged to facilitate the pumping of the accumulated water, and facilitates the subsequent permanent plugging construction of the connecting pipe 3. Further, when the accumulated water between the cofferdam 9 and the connecting pipe 3 is pumped out through the water pumping device 8, waterproof mortar is applied to the side of the sealing wall 5 close to the channel box 1 to prevent water seepage.

[0056] Step S005, a retaining wall 6 is built in the channel box 1 corresponding to the connecting pipe 3 to permanently seal the connecting pipe 3;

[0057] As shown in Figure 3 and Figure 4 When the cofferdam 9 is completed, the water pumping device 8 pumps out the accumulated water, and the retaining wall 6 is built at the connection between the connecting pipe 3 and the channel box 1. The retaining wall 6 is a reinforced concrete structure, the cross section of the retaining wall 6 is in an "L" shape structure, and the retaining wall 6 is located in the channel box 1. The vertical part of the "L" shape structure of the retaining wall 6 is close to the side wall of the channel box 1 and is fitted with the side wall of the channel box 1. The bottom horizontal part of the "L" shape structure faces the channel box 1, and the bottom of the retaining wall 6 is fitted with the inner bottom surface of the channel box 1. The present application sets the retaining wall 6 as an "L" shape structure, and the principle is that when the water in the channel box 1 enters the "L" shape retaining wall 6, the bottom of the retaining wall 6 is subjected to the force of the gravity of the water, which is used to stabilize the retaining wall 6. At the same time, when the water flow in the channel box 1 flows to the retaining wall 6, due to the different height and speed of the wave crest and trough, a vortex and eddy will be formed in the "L" shape structure. This flow will slowly reduce the kinetic energy and height of the water flow impact, thereby weakening the impact on the retaining wall 6.

[0058] As shown in Figure 3As shown, the thickness of the retaining wall 6 (i.e. the vertical part width and the horizontal part width of the "L" shaped retaining wall 6) is not greater than 200mm, the retaining wall 6 of the present application is poured in a two-way reinforced manner, a plurality of steel bars with a diameter of 12mm are arranged inside the retaining wall 6 at a spacing of 150mm to improve the structural strength of the retaining wall 6.

[0059] Meanwhile, the retaining wall 6 is connected to the channel box 1 by means of anchoring, the anchoring can be performed in the existing manner, specifically, holes are drilled on the retaining wall 6, the bottom and the sidewall of the channel box 1, then anchoring glue is injected, (the anchoring glue here can be injection type anchoring glue and / or barrel type anchoring glue, which is not limited by the present application), and then the steel bars are inserted, after the high-strength building anchoring glue is solidified, the steel bars are bonded with the retaining wall 6 and the channel box 1 to realize permanent plugging of the connecting pipe 3.

[0060] It should be noted that when the above steel bars are planted by HRB335 grade steel bars, the strength grade of the concrete of the retaining wall 6 should not be lower than C15; when the above steel bars are planted by HRB400 grade steel bars, the strength grade of the concrete of the retaining wall 6 should not be lower than C20, and if HPB235 grade steel bars are used for planting, the diameter of the steel bars should not be greater than 12mm, and the strength grade of the concrete of the retaining wall 6 should not be lower than C20.

[0061] After the retaining wall 6 permanently pluggs the connecting pipe 3, the cofferdam 9 is removed, the pumping device 8 is taken out, the connecting pipe 3 between the channel box 1 and the sewage pipe 4 is no longer connected, and the working of the channel box 1 and the working of the sewage pipe 4 do not affect each other, that is, the clean water / rainwater of the channel box 1 flows into the river, avoiding the influence of the water level jacking of the downstream sewage pipe 4, so that the sewage in the sewage pipe 4 does not overflow into the channel box 1 through the connecting pipe 3, avoiding the odor generated by the overflow, and not affecting the life of the surrounding residents; at the same time, the sewage in the sewage pipe 4 flows to the sewage treatment plant, and the sewage is treated by the sewage treatment plant, avoiding the clean water / rainwater in the channel box 1 from entering the sewage pipe 4 through the connecting pipe 3, reducing the water flow of the sewage pipe 4, and facilitating the sewage treatment of the sewage treatment plant.

[0062] During any one of steps S002 to S005, a cover plate 2 can be provided on the construction window 101 to facilitate the passage of vehicles or pedestrians, so as to avoid the influence of the construction process on the road traffic. In the present application, the cover plate 2 is preferably a high-strength steel plate, which has the characteristics of high strength, not easy to deform, pressure resistance, etc., and can bear the pressure load when the car passes.

[0063] Step S006, repairing the construction window 101 at the top of the channel box 1 to restore the road surface.

[0064] After the construction in the channel box 1 is completed, the channel box 1 can be restored, the channel box 1 top plate cut in step S001 is placed at the construction window 101, the reinforcement is bound in the construction window 101, and the reinforcement is welded with the reinforcement head 15 reserved around the construction window 101, after the welding is firm, the concrete is poured into the soil pit 10, the C30 fine stone concrete is restored, and after the concrete in the soil pit 10 reaches initial setting for 7 days, the high-strength steel plate can be removed, and the road surface is restored as it is.

[0065] Compared with the prior art, the application provides conditions for daytime traffic opening by opening the construction window 101 on the channel box 1 top plate and placing the support strip 12 and the high-strength steel plate at the construction window 101, and creates conditions for entering the channel box 1 construction by opening the construction skylight, uses the frogman to cooperate with the underwater installation air bag 7 and the sealing wall 5, the air bag 7 and the brick wall make the water in the pipe in a static state, the cofferdam 9 is arranged at the upstream position of the channel box 1 to block the upstream water, the water pumping device 8 is installed to pump and drain, and conditions are created for the subsequent plugging construction of the retaining wall 6, and finally the retaining wall 6 is installed to achieve the effect of permanent plugging. Compared with the prior art, the application does not need to drill multiple holes above the sewage pipe 4, and does not need to occupy a large area of site, avoiding the damage to the ground structure or pipeline caused by drilling. It is suitable for the plugging construction of the sewage pipe 4 under the municipal main road in the urban area, solves the problems that the traditional pipeline plugging construction needs to occupy a large area of site, and the pipeline plugging by drilling is easy to cause damage to the ground structure and may damage other pipelines under the ground.

[0066] The above application embodiment serial numbers are only for description, and do not represent the advantages and disadvantages of the embodiments. The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process conversion using the content of the application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A method for permanently plugging a sewage connecting pipe in a channel box, comprising a channel box (1) and a sewage pipe (4), the channel box (1) and the sewage pipe (4) are located below the ground, and the sewage pipe (4) is located below the channel box (1), a connecting pipe (3) is communicated between the channel box (1) and the sewage pipe (4), characterized in that: The permanent plugging construction method of the sewage connecting pipe in the channel box comprises the following steps: ​ Step S001, excavate the road surface and cover the soil to the top of the channel box (1), and cut a construction window (101) on the top of the channel box (1); Step S002, after cutting the construction window (101) on the top of the channel box (1), enter the inside of the channel box (1) from the construction window (101) to perform underwater work, and use an inflatable air bag (7) to preliminarily plug the connecting pipe (3), so that the water flow in the connecting pipe (3) is in a static state; Step S003, build a cofferdam (9) in the channel box (1), and the cofferdam (9) is located upstream of the connecting pipe (3) to block the water flow upstream of the channel box (1); Step S004, set a water pumping device (8) between the cofferdam (9) and the connecting pipe (3), and discharge the accumulated water between the cofferdam (9) and the connecting pipe (3) through the water pumping device (8); Step S005, build a retaining wall (6) in the channel box (1) corresponding to the connecting pipe (3) to permanently plug the connecting pipe (3); Step S006, repair the construction window (101) on the top of the channel box (1) to restore the road surface.

2. The method according to claim 1, wherein the method is characterized by, It also includes a prefabrication step of a sealing wall (5), and the sealing wall (5) is prefabricated; in step S002, after the water flow in the connecting pipe (3) is in a static state, the inner surface of the connecting pipe (3) is cleaned, and after the cleaning is completed, the prefabricated sealing wall (5) is plugged in the connecting pipe (3) to achieve further plugging of the connecting pipe (3).

3. The method according to claim 2, wherein the method is characterized by, The sealing wall (5) is built with cement mortar and solid bricks.

4. The method according to claim 2, wherein the method is characterized by, In step S004, after the accumulated water between the cofferdam (9) and the connecting pipe (3) is drained, waterproof mortar is brushed on the side of the sealing wall (5) close to the channel box to prevent water seepage.

5. The method according to claim 1, wherein the method is characterized by, In step S005, the retaining wall (6) has an "L" type structure, the vertical part of the "L" type structure is located in the channel box (1) and plugs one end of the connecting pipe (3) close to the channel box (1), and the bottom horizontal part of the "L" type structure is arranged towards the channel box (1).

6. The method according to claim 1, wherein the method is characterized by, The retaining wall (6) is fixedly connected with the channel box (1) through the embedded steel bars.

7. The method according to claim 6, wherein the method is characterized by, The thickness of the retaining wall (6) is not greater than 200 mm.

8. The method according to claim 7, wherein the method is characterized by, During any one of steps S002 to S005, a cover plate (2) can be provided on the construction window (101).

9. The method according to claim 1, wherein the method is characterized by, In step S001, when the construction window (101) is cut, a steel bar head (15) with a length of 180-220 mm is reserved around the construction window (101).

10. The method according to claim 9, wherein the method is characterized by, In step S006, when the construction window (101) on the top of the channel box (1) is repaired, steel bars are bound in the construction window (101), and the steel bars are welded with the steel bar head (15) reserved around the construction window (101), and after the welding is completed, concrete is poured to restore the road surface.

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